Quality from SharpBenchmarks are set by the quality standards of Sharp Solar. Continual checks guarantee a consistently high level of quality. Every module undergoes visual, mechanical, and electrical inspection. This is recognisable by means of the original Sharp label, the serial number, and the Sharp warranty:+2 year product guarantee+ 10 year performance guarantee for a power output of 90%+ min. 20 year performance guarantee for a power output of 80%